Change CFG construction to return a CFGValue from visits to Expr*s.
Change CFG construction to return a CFGValue from visits to Expr*s.

Swift SVN r2651

sdulal/swift,shahmishal/swift,zisko/swift,emilstahl/swift,kperryua/swift,slavapestov/swift,sschiau/swift,slavapestov/swift,tkremenek/swift,therealbnut/swift,MukeshKumarS/Swift,airspeedswift/swift,dduan/swift,manavgabhawala/swift,karwa/swift,ahoppen/swift,KrishMunot/swift,brentdax/swift,johnno1962d/swift,milseman/swift,hughbe/swift,hooman/swift,adrfer/swift,swiftix/swift.old,karwa/swift,Jnosh/swift,gottesmm/swift,devincoughlin/swift,kusl/swift,gregomni/swift,shajrawi/swift,harlanhaskins/swift,deyton/swift,tjw/swift,johnno1962d/swift,tinysun212/swift-windows,adrfer/swift,aschwaighofer/swift,kstaring/swift,uasys/swift,MukeshKumarS/Swift,codestergit/swift,khizkhiz/swift,IngmarStein/swift,Ivacker/swift,jckarter/swift,glessard/swift,stephentyrone/swift,lorentey/swift,return/swift,karwa/swift,jmgc/swift,russbishop/swift,gmilos/swift,frootloops/swift,kstaring/swift,huonw/swift,sdulal/swift,sschiau/swift,hooman/swift,russbishop/swift,JaSpa/swift,hughbe/swift,benlangmuir/swift,tkremenek/swift,dreamsxin/swift,sdulal/swift,allevato/swift,return/swift,gregomni/swift,arvedviehweger/swift,allevato/swift,hughbe/swift,dduan/swift,ahoppen/swift,alblue/swift,deyton/swift,austinzheng/swift,danielmartin/swift,kperryua/swift,practicalswift/swift,ben-ng/swift,therealbnut/swift,hooman/swift,ken0nek/swift,xedin/swift,manavgabhawala/swift,harlanhaskins/swift,felix91gr/swift,modocache/swift,bitjammer/swift,dduan/swift,sschiau/swift,KrishMunot/swift,emilstahl/swift,harlanhaskins/swift,adrfer/swift,jmgc/swift,sschiau/swift,hughbe/swift,shahmishal/swift,Jnosh/swift,mightydeveloper/swift,SwiftAndroid/swift,felix91gr/swift,tardieu/swift,therealbnut/swift,therealbnut/swift,gribozavr/swift,slavapestov/swift,jopamer/swift,shajrawi/swift,tkremenek/swift,hughbe/swift,adrfer/swift,brentdax/swift,kusl/swift,uasys/swift,jopamer/swift,djwbrown/swift,JaSpa/swift,amraboelela/swift,CodaFi/swift,parkera/swift,shajrawi/swift,nathawes/swift,alblue/swift,parkera/swift,khizkhiz/swift,sdulal/swift,glessard/swift,manavgabhawala/swift,calebd/swift,tjw/swift,CodaFi/swift,brentdax/swift,arvedviehweger/swift,ken0nek/swift,arvedviehweger/swift,natecook1000/swift,karwa/swift,JaSpa/swift,ken0nek/swift,khizkhiz/swift,ben-ng/swift,djwbrown/swift,jckarter/swift,airspeedswift/swift,frootloops/swift,modocache/swift,sdulal/swift,tjw/swift,gmilos/swift,tinysun212/swift-windows,kentya6/swift,zisko/swift,rudkx/swift,xedin/swift,return/swift,natecook1000/swift,cbrentharris/swift,manavgabhawala/swift,zisko/swift,devincoughlin/swift,codestergit/swift,gribozavr/swift,LeoShimonaka/swift,allevato/swift,cbrentharris/swift,Jnosh/swift,felix91gr/swift,airspeedswift/swift,SwiftAndroid/swift,jopamer/swift,swiftix/swift.old,ken0nek/swift,natecook1000/swift,brentdax/swift,aschwaighofer/swift,roambotics/swift,harlanhaskins/swift,parkera/swift,apple/swift,Jnosh/swift,parkera/swift,manavgabhawala/swift,swiftix/swift.old,glessard/swift,kperryua/swift,swiftix/swift,stephentyrone/swift,hooman/swift,johnno1962d/swift,nathawes/swift,khizkhiz/swift,xwu/swift,swiftix/swift,frootloops/swift,CodaFi/swift,MukeshKumarS/Swift,jtbandes/swift,codestergit/swift,johnno1962d/swift,xedin/swift,CodaFi/swift,shajrawi/swift,jckarter/swift,alblue/swift,practicalswift/swift,atrick/swift,austinzheng/swift,Ivacker/swift,tinysun212/swift-windows,practicalswift/swift,Jnosh/swift,jmgc/swift,alblue/swift,practicalswift/swift,nathawes/swift,shahmishal/swift,return/swift,zisko/swift,return/swift,milseman/swift,OscarSwanros/swift,modocache/swift,mightydeveloper/swift,OscarSwanros/swift,Ivacker/swift,MukeshKumarS/Swift,shajrawi/swift,parkera/swift,sdulal/swift,gmilos/swift,hughbe/swift,tinysun212/swift-windows,jtbandes/swift,russbishop/swift,milseman/swift,atrick/swift,KrishMunot/swift,austinzheng/swift,tardieu/swift,LeoShimonaka/swift,russbishop/swift,ben-ng/swift,kusl/swift,stephentyrone/swift,cbrentharris/swift,stephentyrone/swift,calebd/swift,modocache/swift,austinzheng/swift,cbrentharris/swift,kentya6/swift,kstaring/swift,russbishop/swift,stephentyrone/swift,bitjammer/swift,devincoughlin/swift,uasys/swift,karwa/swift,JaSpa/swift,gottesmm/swift,lorentey/swift,SwiftAndroid/swift,arvedviehweger/swift,jtbandes/swift,shahmishal/swift,IngmarStein/swift,parkera/swift,felix91gr/swift,calebd/swift,kperryua/swift,calebd/swift,roambotics/swift,tjw/swift,apple/swift,jckarter/swift,SwiftAndroid/swift,felix91gr/swift,gribozavr/swift,sdulal/swift,JGiola/swift,OscarSwanros/swift,atrick/swift,airspeedswift/swift,SwiftAndroid/swift,tardieu/swift,benlangmuir/swift,benlangmuir/swift,danielmartin/swift,mightydeveloper/swift,swiftix/swift.old,karwa/swift,IngmarStein/swift,SwiftAndroid/swift,danielmartin/swift,JaSpa/swift,Ivacker/swift,JGiola/swift,lorentey/swift,tjw/swift,huonw/swift,brentdax/swift,gmilos/swift,slavapestov/swift,uasys/swift,dduan/swift,codestergit/swift,allevato/swift,zisko/swift,IngmarStein/swift,jckarter/swift,mightydeveloper/swift,adrfer/swift,aschwaighofer/swift,rudkx/swift,khizkhiz/swift,devincoughlin/swift,CodaFi/swift,calebd/swift,uasys/swift,frootloops/swift,tardieu/swift,shajrawi/swift,arvedviehweger/swift,harlanhaskins/swift,kusl/swift,apple/swift,gribozavr/swift,airspeedswift/swift,manavgabhawala/swift,cbrentharris/swift,milseman/swift,kstaring/swift,russbishop/swift,devincoughlin/swift,austinzheng/swift,swiftix/swift.old,ben-ng/swift,johnno1962d/swift,glessard/swift,xwu/swift,zisko/swift,benlangmuir/swift,tardieu/swift,KrishMunot/swift,amraboelela/swift,Ivacker/swift,gregomni/swift,shahmishal/swift,codestergit/swift,return/swift,gribozavr/swift,parkera/swift,kusl/swift,therealbnut/swift,swiftix/swift,xedin/swift,gottesmm/swift,return/swift,rudkx/swift,shajrawi/swift,hughbe/swift,OscarSwanros/swift,gottesmm/swift,JGiola/swift,danielmartin/swift,kentya6/swift,mightydeveloper/swift,jopamer/swift,amraboelela/swift,rudkx/swift,gmilos/swift,gottesmm/swift,deyton/swift,dduan/swift,OscarSwanros/swift,gmilos/swift,IngmarStein/swift,JaSpa/swift,apple/swift,shahmishal/swift,lorentey/swift,uasys/swift,johnno1962d/swift,Jnosh/swift,djwbrown/swift,xwu/swift,ahoppen/swift,KrishMunot/swift,glessard/swift,cbrentharris/swift,kentya6/swift,kperryua/swift,MukeshKumarS/Swift,milseman/swift,gribozavr/swift,mightydeveloper/swift,kperryua/swift,emilstahl/swift,khizkhiz/swift,russbishop/swift,cbrentharris/swift,alblue/swift,kstaring/swift,devincoughlin/swift,jmgc/swift,therealbnut/swift,huonw/swift,airspeedswift/swift,aschwaighofer/swift,milseman/swift,jtbandes/swift,emilstahl/swift,apple/swift,gregomni/swift,gottesmm/swift,gregomni/swift,gmilos/swift,kentya6/swift,dduan/swift,bitjammer/swift,shahmishal/swift,calebd/swift,slavapestov/swift,devincoughlin/swift,brentdax/swift,frootloops/swift,jckarter/swift,rudkx/swift,SwiftAndroid/swift,aschwaighofer/swift,bitjammer/swift,xwu/swift,atrick/swift,nathawes/swift,Ivacker/swift,adrfer/swift,alblue/swift,hooman/swift,roambotics/swift,jopamer/swift,karwa/swift,tinysun212/swift-windows,natecook1000/swift,tardieu/swift,aschwaighofer/swift,practicalswift/swift,dduan/swift,deyton/swift,ahoppen/swift,tinysun212/swift-windows,natecook1000/swift,austinzheng/swift,xwu/swift,ben-ng/swift,LeoShimonaka/swift,kentya6/swift,kusl/swift,slavapestov/swift,jckarter/swift,xedin/swift,IngmarStein/swift,djwbrown/swift,ken0nek/swift,danielmartin/swift,danielmartin/swift,benlangmuir/swift,xedin/swift,rudkx/swift,dreamsxin/swift,frootloops/swift,jmgc/swift,atrick/swift,emilstahl/swift,jtbandes/swift,hooman/swift,IngmarStein/swift,kperryua/swift,austinzheng/swift,practicalswift/swift,adrfer/swift,gregomni/swift,devincoughlin/swift,nathawes/swift,LeoShimonaka/swift,swiftix/swift.old,ahoppen/swift,shajrawi/swift,tardieu/swift,codestergit/swift,lorentey/swift,sdulal/swift,xedin/swift,swiftix/swift,lorentey/swift,jtbandes/swift,Ivacker/swift,JGiola/swift,uasys/swift,natecook1000/swift,KrishMunot/swift,apple/swift,swiftix/swift.old,deyton/swift,slavapestov/swift,KrishMunot/swift,amraboelela/swift,bitjammer/swift,karwa/swift,CodaFi/swift,jopamer/swift,xwu/swift,ben-ng/swift,LeoShimonaka/swift,milseman/swift,tjw/swift,sschiau/swift,shahmishal/swift,jopamer/swift,sschiau/swift,tkremenek/swift,OscarSwanros/swift,danielmartin/swift,cbrentharris/swift,xedin/swift,gribozavr/swift,benlangmuir/swift,glessard/swift,deyton/swift,brentdax/swift,jmgc/swift,arvedviehweger/swift,nathawes/swift,calebd/swift,jtbandes/swift,JGiola/swift,harlanhaskins/swift,djwbrown/swift,khizkhiz/swift,roambotics/swift,emilstahl/swift,roambotics/swift,swiftix/swift,ahoppen/swift,deyton/swift,airspeedswift/swift,MukeshKumarS/Swift,allevato/swift,lorentey/swift,tkremenek/swift,swiftix/swift.old,stephentyrone/swift,ben-ng/swift,djwbrown/swift,zisko/swift,huonw/swift,amraboelela/swift,emilstahl/swift,tjw/swift,gribozavr/swift,therealbnut/swift,huonw/swift,practicalswift/swift,modocache/swift,stephentyrone/swift,allevato/swift,felix91gr/swift,natecook1000/swift,manavgabhawala/swift,mightydeveloper/swift,huonw/swift,modocache/swift,gottesmm/swift,Ivacker/swift,sschiau/swift,modocache/swift,tkremenek/swift,emilstahl/swift,johnno1962d/swift,frootloops/swift,bitjammer/swift,ken0nek/swift,allevato/swift,parkera/swift,roambotics/swift,felix91gr/swift,JGiola/swift,aschwaighofer/swift,xwu/swift,LeoShimonaka/swift,tinysun212/swift-windows,amraboelela/swift,swiftix/swift,kusl/swift,JaSpa/swift,kentya6/swift,bitjammer/swift,kusl/swift,MukeshKumarS/Swift,ken0nek/swift,kstaring/swift,huonw/swift,hooman/swift,lorentey/swift,arvedviehweger/swift,djwbrown/swift,practicalswift/swift,jmgc/swift,LeoShimonaka/swift,nathawes/swift,codestergit/swift,kstaring/swift,mightydeveloper/swift,OscarSwanros/swift,alblue/swift,sschiau/swift,CodaFi/swift,swiftix/swift,Jnosh/swift,harlanhaskins/swift,kentya6/swift,atrick/swift,LeoShimonaka/swift,tkremenek/swift,amraboelela/swift